fix: repair defects surfaced by gating CI on lint and typecheck

`npm run check` reported 15 errors and `npm run lint` 20, all pre-existing, so
neither gate could pass. Fixing them turned up three real bugs:

- SignOut destructured `{ error }` off `.then(() => {})`, which resolves to
  undefined, so every sign-out threw a TypeError - after the signed-out event had
  already been emitted. Sign-out also left the user on the protected page they
  were on, still showing its content; it now returns them to the home page and
  re-runs the server loads.

- SignUp passed `redirectTo`, which is not a signUp option and was silently
  ignored, so the confirmation link has always used Supabase's configured site
  URL. Documented rather than changed, since pointing it elsewhere needs an
  absolute allow-listed URL.

- The Pokédex page tracked totalRecordsCreated but never passed it to the box
  view, so the "Processed N entries so far" progress message never rendered.

The rest is typing and dead code: cookie callback parameters in hooks.server.ts
and +layout.ts, the untyped supabase props, a query-builder type that made
PostgREST rows untyped downstream, an unused session destructure, and
`while (true)` paging loops rewritten as `for (;;)`.

src/lib/components/SignOut.svelte

@@ -1,5 +1,7 @@
 <script lang="ts">
+	import type { SupabaseClient } from '@supabase/supabase-js';
 	import { createEventDispatcher } from 'svelte';
+	import { goto } from '$app/navigation';
 	const dispatch = createEventDispatcher();
 
 	function emitSignedOutEvent() {
@@ -7,13 +9,17 @@
 	}
 
 	// Access the supabase client from the layout data
-	export let supabase: any;
+	export let supabase: SupabaseClient;
 
 	async function signOut() {
-		// TODO use the error from the response
-		const { error } = await supabase.auth.signOut().then(() => {
-			emitSignedOutEvent();
-		});
+		// `.then(() => {...})` resolved to undefined, so destructuring `error` off it threw a
+		// TypeError on every sign-out - after the event had already been emitted.
+		const { error } = await supabase.auth.signOut();
+		if (error) console.error('Sign out failed', error);
+		emitSignedOutEvent();
+		// Signing out used to leave the user sitting on the protected page they were on, still
+		// showing its content. Send them to the public home page and re-run the server loads.
+		await goto('/', { invalidateAll: true });
 	}
 </script>